Shimming 318 motor mounts

I shimmed a passenger side motor mount for the drivers side on a 72 340 going in my 68 barracuda if you look at the pictures it doesn't sit flat and the studs are at the bottom of the slots. Either the rubber 20161231_151208.jpg 20161231_151428_001.jpg 20161231_151341.jpg biscuit mounts are wrong or the steel mount is wrong. I need some experts advice it's been year's since I messed with small blocks